Let a note win a recall, not only a fact (#373)

The memory pass ran only after the notes-only gate had already rejected
the same note at the same score. Notes and facts share one vector index,
so a note that failed there failed again — the branch could only ever
return a fact.

Now the memory pass runs first: one search over everything Maven
remembers, one gate, and the memory that clearly matches best answers
(a note gets phrased, a fact is read back). The notes-only pass stays
behind it for notes the vector index does not hold. No threshold moved,
so the set of questions answered is unchanged — only which memory
answers them.

Fixture gained two mixed note+fact cases, so the answerable count goes
25 -> 27: hash recall@1 36.0% -> 37.0% (ratchet 0.32 unchanged, comment
updated), e5 recall@1 72.0% -> 70.4%, false recall still 1/5.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CGeSZxh1DCtRxmFVSYVGvJ

cmd/mavend/recall.go

@@ -2,21 +2,24 @@ package main
 
 import "github.com/kami/maven/internal/memory"
 
-// bestRecall is the read side of the long-term memory store: the top hit's
-// stored text when it clears the confidence gate. This recalls across BOTH
-// notes and facts (facts aren't in the notes table, so this is the only path
-// that can answer "when did I last …?" from a captured fact). A note hit here
-// is redundant with the notes-RAG path — by design; the two indexes can diverge
-// once the backend is swapped for a persistent/external store. ok=false when
-// the hit fails the confidence gate (see memory.Confident: an absolute floor
-// plus a margin over the runner-up) or carries no text.
-func bestRecall(results []memory.Result, minScore, minMargin float64) (string, bool) {
+// bestRecall is the read side of the long-term memory store: the top hit when
+// it clears the confidence gate. The index holds BOTH notes and facts, and
+// either can win — the caller looks at the returned hit's meta["type"] to see
+// which. Facts aren't in the notes table, so this is the only path that can
+// answer "when did I last …?" from a captured fact.
+//
+// The whole hit is returned, not just its text, because "which memory answered"
+// decides how the answer is said: a note gets phrased in Maven's voice, a fact
+// is read back as stored.
+//
+// ok=false when the hit fails the confidence gate (see memory.Confident: an
+// absolute floor plus a margin over the runner-up) or carries no text.
+func bestRecall(results []memory.Result, minScore, minMargin float64) (memory.Result, bool) {
 	if !memory.Confident(results, minScore, minMargin) {
-		return "", false
+		return memory.Result{}, false
 	}
-	text := results[0].Meta["text"]
-	if text == "" {
-		return "", false
+	if results[0].Meta["text"] == "" {
+		return memory.Result{}, false
 	}
-	return text, true
+	return results[0], true
 }